Dental Implantation

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Dental Implantation
The different stress distribution between
normal and abnormal ratio of crown
Cho Young Kuen
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Introductory

• The most frequent surgical procedure performed
  upon humans is dental extraction.
• The most frequently employed prosthesis is the
  complete or partial denture. (Cranin,
  Worthington, 1988)

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Introductory

• Analyzing force transfer at the bone-implant
  interface is an essential step in the overall
  analysis of loading.
• Both implant and bone should be stressed within
  a certain range for physiologic homeostasis.
• (Static, dynamic and fatigue behaviors of dental
  implant using finite element method)

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Introductory

• 3 steps for implantation
• Cut section
• Implant the fixture
• Implant the others
• (abutment, metal frame, occlusal material)

(Http//catalog.nucleusinc.com)
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Introductory

• Assumptions
• The crown ratio of the dente is not always same
  in every dental implantation.
• If trabecula bone density is not enough for
  implatation, how stress distribution is occurred?

(Http//catalog.nucleusinc.com)
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Biomaterials
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Simulation purpose

• Simulate for physical reaction on same structure
  but different ratio of crown
• Case 1. Normal
• Case 2. Abnormal ( 1.5 times )
• Case 3. Abnormal ( 2.0 times )

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Why do abnormal?

• Its caused by position of transplant.
  (e.g. a cuspid, a grinder)
• Jawbone is going down (then turn it black).

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Meshing

• Meshing by Hypermesh

• Crown
• Implant
• Cortical outer
• Spongy
• Cortical inner

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Analysis

• Loading phase
• FX -17.1 N
• FY -114.6 N
• FZ 23.4 N
• FT 118.2 N
• Analyze by ANSYS10.0
• Material properties

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Result
Normal
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Result
Abnormal ( 1.5 times )
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Result
Abnormal ( 2.0 times )
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Result
I make a path to measure the stress by 90 nodes
on the contact surface between cortical outer
bone and implant.
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Result
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Discussion

• There are certain parts the maximum stress is
  occurred.
• Some parts have more stress to take overload
  without overall failure.

• Its means that the life of implant can be
  longer to modify the shape or to fill in the
  trabecula bone.

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Further study

• We assumed that the crown ratio is different
  between each dente, however, it can be make up by
  shape of crown.
• So we need to analyze using various types of
  crown.

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Any Questions?

• ?